高密度电法管线探测试验研究

Study on Detecting Pipeline by High Density Resistivity Method

通过建立地下管线模型,采用有限元法和最小二乘法对管线模型进行数值模拟,分别模拟了四极、偶极、微分和温施装置的探测效果,结果表明四种装置都可以较清晰地识别管线异常,但微分装置和温施装置会出现假异常,容易出现误判,而四极装置和偶极装置具有较高的抗干扰性,更适用于管线探测。基于数值模拟成果,对某电缆隧道沿线周围进行了高密度探测,探测结果确定的管线位置和规模与实际市政资料吻合,说明采用高密度电法对城市地下管线探测是可行有效的。

Through the establishment of underground pipeline model,the finite element method and least square method are used to simulate the pipeline model.The detection effects of Winnerα,Winnerβ,Winnerγand Schlumberger devices are simulated respectively.The results show that the four devices can clearly identify pipeline anomalies,but the Winnerγand Schlumberger device will appear false anomalies,which is easy to misjudge.The Winnerαdevice and Winnerβdevice have high anti-interference performance,which is more suitable for pipeline detection.Based on the results of numerical simulation,high-density detection is carried out around a cable tunnel.The location and scale of the pipeline determined by the detection results are consistent with the actual municipal data,which shows that the high density resistivity method is feasible and effective for urban underground pipeline detection.